A toolkit for transformable materials

How to design materials with reprogrammable shape and function

By Leah Burrows

January 18, 2017

Harvard researchers have developed a general framework to design reconfigurable metamaterials that is scale independent, meaning it can be applied to everything from meter-scale architectures to reconfigurable nano-scale systems (Image courtesy of Johannes Overvelde/Harvard SEAS).

Metamaterials — materials whose function is determined by structure, not composition — have been designed to bend light and sound, transform from soft to stiff, and even dampen seismic waves from earthquakes. But each of these functions requires a unique mechanical structure, making these materials great for specific tasks, but difficult to implement broadly.

But what if a material could contain within its structure, multiple functions and easily and autonomously switch between them?

“In terms of reconfigurable metamaterials, the design space is incredibly large and so the challenge is to come up with smart strategies to explore it,” said Katia Bertoldi, John L. Loeb Associate Professor of the Natural Sciences at SEAS and senior author of the paper. “Through a collaboration with designers and mathematicians, we found a way to generalize these rules and quickly generate a lot of interesting designs.”

Bertoldi and former graduate student Johannes Overvelde, who is the first author of the paper, collaborated with Chuck Hoberman, of the Harvard Graduate School of Design (GSD) and associate faculty at the Wyss and James Weaver, a senior research scientist at the Wyss, to design the metamaterial.

The research began in 2014, when Hoberman showed Bertoldi his original designs for a family of foldable structures, including a prototype of an extruded cube. “We were amazed by how easily it could fold and change shape,” said Bertoldi. “We realized that these simple geometries could be used as building blocks to form a new class of reconfigurable metamaterials but it took us a long time to identify a robust design strategy to achieve this.”

The interdisciplinary team realized that assemblies of polyhedra can be used as a template to design extruded reconfigurable thin-walled structures, dramatically simplifying the design process.

“By combining design and computational modeling, we were able to identify a wide range of different rearrangements and create a blueprint or DNA for building these materials in the future, ” said Overvelde, now scientific group leader of the Soft Robotic Matter group at FOM Institute AMOLF in the Netherlands.

The same computational models can also be used to quantify all the different ways in which the material could bend and how that affected effective material properties like stiffness. This way they could quickly scan close to a million different designs, and select those with the preferred response.

Once a specific design was selected, the team constructed working prototypes of each 3D metamaterial both using laser-cut cardboard and double-sided tape, and multimaterial 3D printing. Like origami, the resulting structure can be folded along their edges to change shape.

“Now that we’ve solved the problem of formalizing the design, we can start to think about new ways to fabricate and reconfigure these metamaterials at smaller scales, for example through the development of 3D-printed self actuating environmentally responsive prototypes,” said Weaver.

“This framework is like a toolkit to build reconfigurable materials,” said Hoberman. “These building blocks and design space are incredibly rich and we’ve only begun to explore all the things you can build with them.”

This work was supported by the Materials Research Science and Engineering Center and the National Science Foundation.

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Harvard researchers have developed a general framework to design reconfigurable metamaterials that is scale independent, meaning it can be applied to everything from meter-scale architectures to reconfigurable nano-scale systems (Image courtesy of Johannes Overvelde/Harvard SEAS).

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Description:

Prototypes of the reconfigurable, 3D metamaterial were made using laser-cut cardboard and double-sided tape, and multimaterial 3D printing. Like origami, the resulting structure can be folded along their edges to change shape.

Credits:

Johannes Overvelde/Harvard SEAS

Description:

This reconfigurable material is made from a new general framework. The design strategy is scale independent, meaning it can be applied to everything from meter-scale architectures to reconfigurable nano-scale systems such as photonic crystals, waveguides and metamaterials to guide heat.

Credits:

Johannes Overvelde/Harvard SEAS

Description:

This reconfigurable material is made from a new general framework. The design strategy is scale independent, meaning it can be applied to everything from meter-scale architectures to reconfigurable nano-scale systems such as photonic crystals, waveguides and metamaterials to guide heat.

Credits:

Johannes Overvelde/Harvard SEAS

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SIDEBAR

The collaboration between Hoberman, Bertoldi, Overvelde and Weaver was on display at Le Laboratoire Cambridge. In an exhibit called 10°, the team developed a series of original, reconfigurable mechanisms termed “prismatic structures” based on crystal-lattice geometries. Visitors transformed the kinetic sculptures through hands-on interaction. Read more about the exhibit here.